1996 TOYOTA LAND CRUISER Position

I00493
Cruise Control ECUIDL
C17 21
G−W
ECM
IDL IH1
E5 19
G−W
11
Threottle Position Sensor G−W
DI−316
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Idle Switch Circuit
CIRCUIT DESCRIPTION
When the idle switch in turned ON, a signal is sent to the ECU. The ECU uses\
this signal to correct the dis-
crepancy between the throttle valve position and the actuator position sensor val\
ue to enable accurate
cruise control at the set speed. If the idle switch is malfunctioning, problem\
symptoms also occur in the en-
gine, so also inspect the engine.
WIRING DIAGRAM
DI5OJ−02
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AB0119I00053 I00031
ON
IDL
(−) (+)
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−317
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check voltage between terminal IDL of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Disconnect the ECM and ABS ECU connectors.
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL of ECU connector and
body ground when the throttle valve is fully closed and fully
opened.
OK:
Throttle valve positionVoltage
Fully opened10 − 14 V
Fully closedBelow 2 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 ).
NG
2 Check harness and connector between ECM and throttle position sensor (See page IN−28 ).
NG Repair or replace harness or connector.
OK
3 Check throttle position sensor circuit (See page DI−35).
NG Replace throttle position sensor.
OK
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I00052
Throttle Position Sensor
3
4
DI−318
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
4 Check throttle position sensor.
PREPARATION:
Disconnect the throttle position sensor connector.
CHECK:
Measure resistance between terminals 3 and 4 of throttle posi-
tion sensor connector when the throttle valve is fully closed and
fully opened.
OK:
Throttle valve positionResistance
Fully opened1 MΩ or higher
Fully closedBelow 2.3 kΩ
NG Replace throttle position sensor.
OK
5 Check for open and short in harness and connector between cruise control\
ECU and throttle position sensor, throttle position sensor and body ground
(See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN−28 ).
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I00019
ECT
(−) (+)
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−321
1996 LAND CRUISER (RM451U)
3 Check voltage between terminal ECT of cruise control ECU connector and body
ground (On test drive).
PREPARATION:
(a) Connect the ECU connector.
(b) Test drive after engine warms up.
CHECK:
Check voltage between terminal ECT of ECU connector and
body ground when OD switch is ON and OFF.
OK:
OD switch positionVoltage
ON8 − 14 V
OFFBelow 0.5 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 ).
NG
4 Check harness and connector between terminal ECT of cruise control ECU a\
nd electronically controlled transmission solenoid (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU.
5 Check harness and connector between terminal OD of cruise control ECU an\
d terminal OD1 of ECM (See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−28 ).
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I00495
Cruise Control ECUD
2
Y Y
B
B 4
Instrument Panel Fuse Block B−O
IH1
1 3
6
B−O
GAUGE
9
2 4
Ignition Switch C17
B−Y FL AM1 AM1
EA2 2
1
B
B 6
Battery 2
1 W
2 2
B−L
A/T Indicator Light
(Park/Neutral Position Switch)
IH24
P1
P1
F11 F11 J4
JUNCTION
CONNECTOR
I12 I12 Fusible Link
F6 2
D
Fusible Link
Y
DI−322
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
When the shift position is put in except D position, a signal is sent from t\
he park/neutral position switch to
the ECU. When this signal is input during cruise control driving, the EC\
U cancels the cruise control.
WIRING DIAGRAM
DI5OL−02
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Input SignalIndicator Light
Blinking Pattern
Turn PNP switch
OFF (Shift to
except D position)
LightON
OFF SW ON
SW OFF
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−323
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check starter operation.
CHECK:
Check that the starter operates normally and that the engine starts.
NG Proceed to engine troubleshooting (See page DI−1).
OK
2 Input signal check.
PREPARATION:
See input signal check on page DI−286.
CHECK:
Check the indicator light when shifting into except D position.
OK:
The indicator light goes off when shifting into except
D position.
OK Proceed to next circuit inspection shown on problem symptoms table (See page DI−295 ).
NG
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AB0119I00017 I00026
ON
D
(−)
(+)
DI−324
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
3 Check voltage between terminal D of cruise control ECU connector and body
ground.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminal D of ECU connector and
body ground when shifting into D position and other positions.
OK:
Shift PositionVoltage
D position10 − 14 V
Other positionsBelow 1 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 ).
NG
4 Check harness and connector between cruise control ECU and park/neutral position switch (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−28 ).
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N15969
35
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−331
1996 LAND CRUISER (RM451U)
2 Check main switch continuity.
PREPARATION:
(a) Remove steering wheel center pad (See page SR−11).
(b) Disconnect the control switch connector.
CHECK:
Check continuity between terminals 3 and 5 of control switch
connector when main switch is held on and off.
OK:
Switch positionTester connectionSpecified condition
OFF3 − 5No continuity
Hold ON3 − 5Continuity
NG Replace control switch.
OK
3 Check harness and connector between cruise control ECU and main switch (\
See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−28 ).
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